Its something you should care about. I care about the privacy issues here the same way I care about the potential dangers of self-driving cars, or even current generation aircraft. Yes, there is a risk involved, but the existence of the technology can vastly improve the life of its users, and we should be doing what we can to contain the risk, not stifle the technological innovations. I, personally, can't wait for the first self-driving cars, even though I know without a shadow of a doubt there will be a major catastrophe within a decade or two of them hitting the streets in numbers. The proper way to proceed is to take these concerns and watch for when they slip up, when the mistakes are made, and at that point deal with them both through personal preferences (stop using Windows) and through legal means.